toolboxes don't reset reporters after parser errors

[scabug]

ToolBox potentially has a bug in the implementation of parseExpr. A call with a string containing a syntax error, produces a ToolBoxError. A subsequent call with a string containing correct code results in the same error:

scala> val tb = m.mkToolBox() 
tb: scala.tools.reflect.ToolBox[reflect.runtime.universe.type] = scala.tools.reflect.ToolBoxFactory$ToolBoxImpl@1f521f12 

scala> tb.parseExpr("def x = {}") // works fine 
res34: tb.u.Tree = def x = () 

scala> tb.parseExpr("def x = {") 
scala.tools.reflect.ToolBoxError: reflective compilation has failed: 

'}' expected but eof found. 
<strack-trace> 

scala> tb.parseExpr("def x = {}") // doesn't work any more 
scala.tools.reflect.ToolBoxError: reflective compilation has failed: 

'}' expected but eof found. 
<strack-trace> 

[scabug]

Imported From: https://issues.scala-lang.org/browse/SI-5942?orig=1
Reporter: @xeno-by
Affected Versions: 2.10.0

[scabug]

@xeno-by said:
http://groups.google.com/group/scala-user/browse_thread/thread/88e89d154e79826d

[scabug]

@xeno-by said:
scala/scala#1328

[scabug]

@xeno-by said:
scala/scala@5e6d069